ONE OF THE RAREST AMPHIBIANS in the world is the tiny Romer’s Tree Frog (Philautus romeri), discovered in a sea cave on Lamma Island, Hong Kong, in 1952. The cave collapsed a year later and the species was believed to be extinct, until other Romer’s tree frogs were found on adjacent islands.

Romer's tree frog is the smallest of the Hong Kong frogs, measuring 1.5 - 2cm, so it is perhaps not surprising that it was only recently discovered.